A shutoff tool for being entered into a well bore and shutting off openings or leaks, said shutoff tool comprising: one or more enclosures prepared for comprising a sealant, said sealant being capable of shutting off openings or leaks when cured. An outer inflatable bladder arranged outside and covering said one or more enclosures, said outer inflatable bladder being prepared for rupturing in positions where it is not supported during inflation, said rupturing will provide access from said one or more enclosures to the outside of said outer inflatable bladder. An inner inflatable bladder arranged inside the outer inflatable bladder and such that said one or more enclosures will be arranged between the outer and the inner inflatable bladders, such that when inflated said inner inflatable bladder can exert a pressure on said one or more enclosures. A core arranged inside said inner inflatable bladder, and prepared for supplying a pressurized fluid into said inner inflatable bladder.
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13. A shutoff tool for being entered into a well bore and shutting off openings or leaks, said shutoff tool comprising:
an inner bladder positioned;
a core positioned within the inner bladder configured to supply a pressurized fluid into said inner bladder to thereby expand the inner bladder;
one or more enclosures that comprise a sealant that is configured to seal and opening, the one or more enclosures are positioned on an outer surface of the inner bladder;
an outer bladder arranged over the inner bladder and the one or more enclosures, wherein the outer bladder is configured to expand with the inner inflatable bladder, wherein the outer bladder is configured to expand in a section where it is not supported and then to rupture in regions where an outer surface of the outer bladder is not supported when the sealant within the one or more enclosures is pressurized, wherein the sealant flows out of the outer bladder through the rupture, wherein the core further comprises at least one fluid passage for providing a path for pumping sealant into said one or more enclosures.
1. A shutoff tool for being entered into a well bore and shutting off openings or leaks, said shutoff tool comprising:
one or more enclosures prepared for comprising a sealant, said sealant being capable of shutting off openings or leaks when cured,
an outer inflatable bladder arranged outside and covering said one or more enclosures, said outer inflatable bladder is configured to rupture when a volume of sealant within an unsupported section of the outer inflatable bladder is increased, wherein a ruptured section of said outer inflatable bladder provides access from said one or more enclosures to an outside of said outer inflatable bladder,
an inner inflatable bladder arranged inside the outer inflatable bladder such that said one or more enclosures will be arranged between the outer inflatable bladder and the inner inflatable bladder, such that when inflated said inner inflatable bladder can exert a pressure on said one or more enclosures,
a core arranged inside said inner inflatable bladder, and prepared for supplying a pressurized fluid into said inner inflatable bladder, wherein the core comprises at least one fluid passage for providing a path for pumping sealant into said one or more enclosures.
7. A method for shutting off openings or leaks, said method comprising the steps of:
providing a shutoff tool comprising:
one or more enclosures prepared for comprising a sealant, said sealant being capable of shutting off openings or leaks when cured,
an outer inflatable bladder arranged outside and covering said one or more enclosures, said outer inflatable bladder is configured to inflate in a section where it is not supported and then rupture when said sealant is pumped into said enclosures, said rupturing will provide access from said one or more enclosures to an outside of said outer inflatable bladder,
an inner inflatable bladder arranged inside the outer inflatable bladder such that said one or more enclosures will be arranged between the outer inflatable bladder and the inner inflatable bladder, such that when inflated said inner inflatable bladder can exert a pressure on said one or more enclosures,
a core arranged inside said inner inflatable bladder, and prepared for supplying a pressurized fluid into said inner inflatable bladder, wherein the core comprises at least one fluid passage for providing a path for pumping sealant into said one or more enclosures;
inserting the shutoff tool into a well bore tubing;
positioning said shutoff tool such that the inner inflatable bladder is at a position of an opening or leak to be shut off;
pressurizing said outer inflatable bladder and inner inflatable bladder through the core to thereby press the outer inflatable bladder against the opening or leak;
pressing sealant into an enclosure of the one or more enclosures until the outer inflatable bladder ruptures, creating open access to the opening or leak
pressing sealant to flow out of the enclosure and into the opening or leak;
deflating the inner inflatable bladder, thereby allowing the shutoff tool to be removed from the well bore.
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15. The shutoff tool according to
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This application claims the benefit under 35 U.S.C. §371 of International Application No. PCT/EP2009/052871, filed Mar. 11, 2009, which claims priority to U.S. Provisional Application No. 61/036,255, filed Mar. 13, 2008 and Danish Application No. PA 2008 00388, filed Mar. 13, 2008, the contents of all of which are incorporated herein by reference in their entirety.
The invention relates to a shutoff tool for entering a well bore and shutting off openings or leaks.
The background for this invention.
Sliding sleeves (also called sliding side doors or SSDs) in a well bore sometimes become stuck in an open position and cannot be closed despite the application of hammering, bead blasting or acid spotting. If water or gas enters the wellbore through such a sleeve, it may be desirable to shut it off. The tool and the method could also be used for closing other openings or leaks. It is important that the tool does not significantly reduce the minimum internal diameter, leading to a restriction that could prevent subsequent well bore operations further along the well bore.
Tools for well bore operations with an inflatable bladder are known from WO 2006/084597 A1, where the inflatable bladder is used as a mould for displacement of cement. This kind of tool would, however, not be feasible for solving the problem mentioned above.
The above problem has been found to be solved by a shutoff tool comprising one or more enclosures prepared for comprising a sealant, said sealant being capable of shutting off openings or leaks when cured; further comprising an outer inflatable bladder arranged outside and covering said one or more enclosures, said outer inflatable bladder being prepared for rupturing in positions where it is not supported during inflation, said rupturing providing access from said one or more enclosures to the outside of said outer inflatable bladder; further comprising an inner inflatable bladder arranged inside the outer inflatable bladder and such that said one or more enclosures will be arranged between the outer and the inner inflatable bladders, such that pressure can be exerted on said one or more enclosures; further comprising a core arranged inside said inner inflatable bladder, and prepared for supplying a pressurised fluid into said inner inflatable bladder.
This tool has the advantage of being simple in operation and leaves minimum obstruction. Furthermore, it can be applied for all kind of openings or leaks.
In a further embodiment of the invention the core of the shutoff tool is arranged centrally inside said inner inflatable bladder, and is extending in a longitudinal direction.
In a preferred embodiment of the shutoff tool the sealant is epoxy, preferably a two compound epoxy, giving a strong and durable sealing of the opening.
In a further embodiment the one or more enclosures follow at least part of a helical pattern around said core, when said inner and outer bladders are inflated. Seen in a side view the enclosures will in this embodiment extend diagonally. This has the advantage of making it easier to position the tool.
The invention also concerns a method for shutting off openings or leaks, said method comprising the steps of: a) entering a tool according to any one of the previous claims into a well bore tubing; b) positioning said tool such that the inflatable bladder is at the position of the opening or leak to be shut off; c) pressurising said inner bladder through the core, whereby the two bladders are simultaneously inflated; d) pressing the outer bladder against the well-bore such that it covers the opening or leak; e) continuing to pump sealant through the one or more enclosures and increasing the pressure until the bladder ruptures, creating access to the opening or leak; f) continuing to pump such that sealant is pressed out through the ruptured portion of the bladder into the annular space surrounding the opening or leak; g) deflating the inner bladder, thereby allowing the tool to be removed from the well bore.
This method is relatively simple to perform and may be preferable to trying to shift sliding sleeves mechanically when it is suspected or known that they are stuck in place.
In a preferred embodiment of the method the sealant is a two-compound epoxy.
Embodiments of the invention are now described in further detail with reference to the drawings.
In this example, the tubing 2 provides a production conduit through which the oil and/or gas will flow. Isolation packers 8 are placed with some interval distance between the reservoir liner 7 and the tubing 2. The isolation packers 8 divide the annular space between the reservoir liner 7 and the tubing 2 into separate sections.
In the horizontal part of the well bore, sliding sleeve, 5 are arranged on the tubing 2. Each SSD 5 provides apertures or ports 15 through which the oil or gas can enter the tubing 2. These apertures can be closed or opened during operation of the well. They will for example be closed if a section of the reservoir between two packers 8 starts to produce water. In one embodiment, screens for removing sand particles from the fluid of oil and gas might be arranged on the outside of the SSD 5. The packers 8 prevent flow in the annular space between the tubing 2 and the reservoir liner 7. Such a flow could go from the zone around one SSD 5 to a neighbouring SSD 5. The element comprising the apertures or ports 15 is a standard element.
The shutoff tool according to the invention can be applied in solving this problem by sealing off the SSD. A simple embodiment of the tool is shown in
The idea with the tool according to the invention is that the tool can be run into the well bore in a deflated state. The two part inflatable bladder is positioned across the apertures or ports in the SSD. At this position, the inner inflatable bladder 11 is filled with hydraulic fluid 14, pumped through a core 13 until the outer inflatable bladder is pressed against the internal surface of the SSD.
Enclosures 12 or grooves for the sealant are arranged in the space formed between the inner and the outer inflatable bladder 11. An example of the arrangement of such enclosures 12 is illustrated in
The outer bladder, e.g. manufactured of rubber, another elastomeric material or metal sheet is designed such that it will rupture at the positions where it is not supported by the well tubular, i.e. where the apertures or ports of the SSD are positioned. It is also designed such that the rupture will establish a path from the enclosure and into the aperture of the SSD. The outer bladder ruptures when the pressure inside the enclosures 12 exceeds a certain level.
When the outer bladder ruptures at the position of the aperture of the SSD, the sealant will be forced from the enclosure and through the rupture into the SSD aperture. The injection of sealant continues while the inflation of the inner bladder is maintained, forcing sealant through the SSD apertures and into the surrounding annular space.
The diagonal orientation or part of a helical pattern of the enclosures or grooves between the two bladders facilitates that the sealant has a direct path through one of the SSD 5 apertures 15. The achievement of this direct path will be independent on the radial orientation of the shutoff tool due to this diagonal orientation or helical pattern. This orientation or pattern of the enclosures also provides a larger margin for error on depth positioning of the tool as compared to a radial enclosure arrangement.
A sealant suitable for this purpose could be an epoxy, preferably a two compound epoxy. The curing time of the sealing compound shall be selected according to the down hole conditions in the specific well bore. The sealing compound must be selected such that it has sufficient time to leave the enclosure in the tool and enter the annular space, but not sufficient time to slump before curing.
In order to ensure complete and uniform distribution of the sealing compound, the density of the sealing compound should be selected to match the density of the fluid in the annular space surrounding the sliding sleeve.
The inner inflatable bladder 11 must be inflated during curing of the sealant, in order to keep the outer inflatable bladder in position to prevent the sealant from entering to the inner side of the tubing.
When the sealing compound is sufficiently cured to keep the SSD aperture shut, the inner inflatable bladder shall be deflated, thereby allowing the shut-off tool to be retrieved from the well bore.
The outer inflatable bladder could be manufactured from or coated with a material to which the sealant will not adhere during curing. If the sealant is epoxy such material could be cured epoxy, polyethylene, paraffin wax petroleum jelly or wax paper. In another embodiment, the outer bladder could be designed such that it detaches from the tool and remains behind in the well-bore.
Heijnen, Wilhelmus Hubertus Paulus Maria, Dean, Claire
Patent | Priority | Assignee | Title |
11828132, | Feb 28 2022 | Saudi Arabian Oil Company | Inflatable bridge plug |
Patent | Priority | Assignee | Title |
2631673, | |||
2769498, | |||
3379251, | |||
3727691, | |||
4064941, | Aug 02 1976 | Phillips Petroleum Company | Apparatus and method for mixing separated fluids downhole |
4417625, | Mar 03 1980 | Mobell Blowout Services Limited | Annulus plugging |
4462714, | Apr 04 1983 | DOWELL SCHLUMBERGER INCORPORATED, | Method and apparatus for setting a cement plug in the wide-mouth shaft of an earth cavern |
4739829, | Dec 11 1986 | Wireline operated oil well dump bailer | |
4913232, | Jan 20 1988 | HUTCHINSON, A FRENCH CORP ; MERIP OIL TOOLS INTERNATIONAL, A FRENCH CORP | Method of isolating production zones in a well, and apparatus for implementing the method |
4943610, | Nov 30 1987 | UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE SECRETARY OF THE ARMY | Non-shrinking, dimensionally-stable modified epoxy resins |
4972906, | Sep 07 1989 | Conoco Inc. | Method for selective plugging of a zone in a well |
5028213, | Apr 19 1988 | American Sigma, Inc. | Convertible and variable-length groundwater devices, components therefor, and methods of constructing and utilizing same |
5240074, | Feb 11 1992 | Oryx Energy Company | Method for selectively controlling flow across slotted liners |
5404946, | Aug 02 1993 | The United States of America as represented by the Secretary of the | Wireline-powered inflatable-packer system for deep wells |
5582251, | Apr 17 1995 | Baker Hughes Incorporated | Downhole mixer |
6196315, | Mar 05 1997 | Texaco Inc. | Methods for treating underground formations |
6616716, | Dec 15 1997 | Maersk Olie & Gas A/S | Method of improving the flow properties of a crude oil or natural gas liquid |
6848519, | Jun 13 2002 | Halliburton Energy Services, Inc. | Methods of forming a chemical casing |
6955216, | Nov 24 1999 | Shell Oil Company | Device for injecting a fluid into a formation |
7306033, | Aug 04 2004 | VERTICE OIL TOOLS, INC | Apparatus for isolating zones in a well |
7523785, | Mar 09 2006 | TOTAL E&P DANMARK A S | System for injecting a substance into an annular space |
20010027868, | |||
20060027371, | |||
20060102336, | |||
20060144593, | |||
20060185855, | |||
20060234871, | |||
20070114016, | |||
20070209797, | |||
EP819830, | |||
EP898050, | |||
EP1223303, | |||
EP1653042, | |||
EP1653043, | |||
GB2153409, | |||
GB2300015, | |||
WO2005078235, | |||
WO2006008490, | |||
WO2006084597, | |||
WO2007022834, | |||
WO2007101444, | |||
WO2007124041, | |||
WO9706346(A1), | |||
WO2006079659, |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Mar 11 2009 | MAERSK OLIE OG GAS A/S | (assignment on the face of the patent) | / | |||
Jun 11 2010 | HEIJNEN, WILHELMUS HUBERTUS PAULUS MARIA | MAERSK OLIE OG GAS A S | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 025997 | /0968 | |
Sep 25 2013 | DEAN, CLAIRE | MAERSK OLIE OG GAS A S | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 031330 | /0290 | |
Jul 18 2018 | MAERSK OLIE OG GAS A S | TOTAL E&P DANMARK A S | CHANGE OF NAME SEE DOCUMENT FOR DETAILS | 051517 | /0298 |
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